Computer Security Lecture 4.1: DES Supplementary Material

Benha University

http://www.bu.edu.eg

We will discuss the following: Data Encryption Standard, DES Algorithm, DES Key Creation

https://www.youtube.com/watch?v=1-lF4dePpts&list=PLKYmvyjH53q13_6aS4VwgXU0Nb_4sjwuf

Transcript

1. DES Supplementary Material DES Supplementary Material
2. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text Permuted choice 1 Left Circular Shift Left Circular Shift Left Circular Shift 64-bit Key Permuted choice 2 Permuted choice 2 Permuted choice 2 56 bit 56 bit 56 bit 56 bit 56 bit 56 bit 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
3. DES Supplementary Material Permuted choice 1 Left Circular Shift Left Circular Shift Left Circular Shift 64-bit Key Permuted choice 2 Permuted choice 2 Permuted choice 2 56 bit 56 bit 56 bit 56 bit 56 bit 56 bit 48 bit 48 bit 48 bit K1 K2 K16
4. DES Supplementary Material Permuted choice 1 Left Circular Shift Left Circular Shift Left Circular Shift 64-bit Key Permuted choice 2 Permuted choice 2 Permuted choice 2 56 bit 56 bit 56 bit 56 bit 56 bit 56 bit 48 bit 48 bit 48 bit K1 K2 K16
5. DES Supplementary Material 57 49 41 33 25 17 9 1 58 50 42 34 26 18 10 2 59 51 43 35 27 19 11 3 60 52 44 36 63 55 47 39 31 23 15 7 62 54 46 38 30 22 14 6 61 53 45 37 29 21 13 5 28 20 12 4
6. DES Supplementary Material Permuted choice 1 Left Circular Shift Left Circular Shift Left Circular Shift 64-bit Key Permuted choice 2 Permuted choice 2 Permuted choice 2 56 bit 56 bit 56 bit 56 bit 56 bit 56 bit 48 bit 48 bit 48 bit K1 K2 K16
7. DES Supplementary Material Key # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Left Shift 1 1 2 2 2 2 2 2 1 2 2 2 2 2 2 1
8. DES Supplementary Material Permuted choice 1 Left Circular Shift Left Circular Shift Left Circular Shift 64-bit Key Permuted choice 2 Permuted choice 2 Permuted choice 2 56 bit 56 bit 56 bit 56 bit 56 bit 56 bit 48 bit 48 bit 48 bit K1 K2 K16
9. DES Supplementary Material 14 17 11 24 1 5 3 28 15 6 21 10 23 19 12 4 26 8 16 7 27 20 13 2 41 52 31 37 47 55 30 40 51 45 33 48 44 49 39 56 34 53 46 42 50 36 29 32
10. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
11. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
12. DES Supplementary Material 58 50 42 34 26 18 10 2 60 52 44 36 28 20 12 4 62 54 46 38 30 22 14 6 64 56 48 40 32 24 16 8 57 49 41 33 25 17 9 1 59 51 43 35 27 19 11 3 61 53 45 37 29 21 13 5 63 55 47 39 31 23 15 7
13. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
14. DES Supplementary Material − − Expansion Permutation XOR S-Box Permutation XOR 32 bit 48 bit 48 bit 48 bit 32 bit 32 bit 32 bit 32 bit 32 bit 32 bit
15. DES Supplementary Material − − Expansion Permutation XOR S-Box Permutation XOR 32 bit 48 bit 48 bit 48 bit 32 bit 32 bit 32 bit 32 bit 32 bit 32 bit
16. DES Supplementary Material 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 1 2 3 4 5 4 5 6 7 8 9 8 9 10 11 12 13 12 13 14 15 16 17 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16 17 18 19 20 21 20 21 22 23 24 25 24 25 26 27 28 29 28 29 30 31 23 1 24 bit 24 bit 16 bit 16 bit
17. DES Supplementary Material 32 1 2 3 4 5 4 5 6 7 8 9 8 9 10 11 12 13 12 13 14 15 16 17 16 17 18 19 20 21 20 21 22 23 24 25 24 25 26 27 28 29 28 29 30 31 32 1
18. DES Supplementary Material − − Expansion Permutation XOR S-Box Permutation XOR 32 bit 48 bit 48 bit 48 bit 32 bit 32 bit 32 bit 32 bit 32 bit 32 bit
19. DES Supplementary Material 24 bit 24 bit 16 bit 16 bit S-Box 1 S-Box 2 S-Box 3 S-Box 4 S-Box 5 S-Box 6 S-Box 7 S-Box 8
20. DES Supplementary Material 0 1 2 . . . 15 0 1 2 3 S-Box 6 bits 4 bits
21. DES Supplementary Material  S-Box 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7 1 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8 2 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0 3 15 12 8 2 4 9 1 7 5 11 3 14 10 0 6 13
22. DES Supplementary Material  S-Box 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 15 1 8 14 6 11 3 4 9 7 2 13 12 0 5 10 1 3 13 4 7 15 2 8 14 12 0 1 10 6 9 11 5 2 0 14 7 11 10 4 13 1 5 8 12 6 9 3 2 15 3 13 8 10 1 3 15 4 2 11 6 7 12 0 5 14 9
23. DES Supplementary Material  S-Box 3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 10 0 9 14 6 3 15 5 1 13 12 7 11 4 2 8 1 13 7 0 9 3 4 6 10 2 8 5 14 12 11 15 1 2 13 6 4 9 8 15 3 0 11 1 2 12 5 10 14 7 3 1 10 13 0 6 9 8 7 4 15 14 3 11 5 2 12
24. DES Supplementary Material  S-Box 4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 7 13 14 3 0 6 9 10 1 2 8 5 11 12 4 15 1 13 8 11 5 6 15 0 3 4 7 2 12 1 10 14 9 2 10 6 9 0 12 11 7 13 15 1 3 14 5 2 8 4 3 3 15 0 6 10 1 13 8 9 4 5 11 12 7 2 14
25. DES Supplementary Material  S-Box 5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 2 12 4 1 7 10 11 6 8 5 3 15 13 0 14 9 1 14 11 2 12 4 7 13 1 5 0 15 10 3 9 8 6 2 4 2 1 11 10 13 7 8 15 9 12 5 6 3 0 14 3 11 8 12 7 1 14 2 13 6 15 0 9 10 4 5 3
26. DES Supplementary Material  S-Box 6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 12 1 10 15 9 2 6 8 0 13 3 4 14 7 5 11 1 10 15 4 2 7 12 9 5 6 1 13 14 0 11 3 8 2 9 14 15 5 2 8 12 3 7 0 4 10 1 13 11 6 3 4 3 2 12 9 5 15 10 11 14 1 7 6 0 8 13
27. DES Supplementary Material  S-Box 7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 4 11 2 14 15 0 8 13 3 12 9 7 5 10 6 1 1 13 0 11 7 4 9 1 10 14 3 5 12 2 15 8 6 2 1 4 11 13 12 3 7 14 10 15 6 8 0 5 9 2 3 6 11 13 8 1 4 10 7 9 5 0 15 14 2 3 12
28. DES Supplementary Material  S-Box 8 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 13 2 8 4 6 15 11 1 10 9 3 14 5 0 12 7 1 1 15 13 8 10 3 7 4 12 5 6 11 0 14 9 2 2 7 11 4 1 9 12 14 2 0 6 10 13 15 3 5 8 3 2 1 14 7 4 10 8 13 15 12 9 0 3 5 6 11
29. DES Supplementary Material − − Expansion Permutation XOR S-Box Permutation XOR 32 bit 48 bit 48 bit 48 bit 32 bit 32 bit 32 bit 32 bit 32 bit 32 bit
30. DES Supplementary Material 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 7 20 21 29 12 28 17 1 15 23 26 5 18 31 10 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 2 8 24 14 32 27 3 9 19 13 30 6 22 11 4 25
31. DES Supplementary Material 16 7 20 21 29 12 28 17 1 15 23 26 5 18 31 10 2 8 24 14 32 27 3 9 19 13 30 6 22 11 4 25
32. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
33. DES Supplementary Material 40 8 48 16 56 24 64 32 39 7 47 15 55 23 63 31 38 6 46 14 54 22 62 30 37 5 45 13 53 21 61 29 36 4 44 12 52 20 60 28 35 3 43 11 51 19 59 27 34 2 42 10 50 18 58 26 33 1 41 9 49 17 57 25
34. DES Supplementary Material Initial permutation Round 1 Round 2 Round 16 32 bit Swap Final permutation 64-bit Plain text 64-bit Cipher text 48 bit 48 bit 48 bit K1 K2 K16 64 bit 64 bit 64 bit 64 bit 64 bit
35. DES Supplementary Material facebook.com/mloey mohamedloey@gmail.com twitter.com/mloey linkedin.com/in/mloey mloey@fci.bu.edu.eg mloey.github.io
36. DES Supplementary Material www.YourCompany.com © 2020 Companyname PowerPoint Business Theme. All Rights Reserved. THANKS FOR YOUR TIME